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Respiratory and cardiac activity of killer whales

Respiratory and cardiac activity of killer whales whaled III, MERRILL P. SPENCER, THOMAS A. GORNALL THOMAS C, POULTER VirgKu Mason Research Center, Seattle, Washington, Stanford &search In&u te, hfenlo Park, CalLfornid SPENCER, MERRIX,LP., THOMASA. GORNALLIII, THOMASC. POULTER. . J. Appl. Physiol. 22(5): 974-981. q67.-Orca in Puget Sound San Juan Isls usually surface every 4-5 min taking 2-5 breaths at 5-10 set intervals; z 2-min soundings were observed. A confined undisturbed 6.56 m, 3,4r4-kg male averaged periods 56.5 sec. A 4.27-m, r,ogo-kg female beached for flow curves, recorded from a calibrated “basket” pneumotachygraph, showed a tidal volume averaging 46.2 liters; expiration duration averaged 0.59 set, I 29 liters/set peak flow; inspiration, blowhole exped, 0.75 set, 90.2 liters/set. A suction-cup electrode attached to an electrocardiograph by insulated wires gave heart rates at 60 beats/min just before to 15 set after the blow, switching to 3o/min when submerged. Male female ECG’s disclosed no P wave, an inverted T wave, simple R wave. Phonations caused dilatation nasal sacs aside the blowhole. Male female sounds are distinctive. Phonation signals last 0.25-5 set, the fundamental from 340- 1,400 cycles/set with defined harmonics extending to at least 70 kc. The variations heart rate are discussed-in relationship to sinus tachycardia man. respiration ; http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Physiology The American Physiological Society

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